Cannot Insert Duplicate Key Row In Object 'dbo.blabla..' With Unique Index 'Idx_blablabl'. The Statement Has Been Terminated. At
We are developing a project that is expected to hold TB of data and the back end used is SQL Server 2005.
I have the following problem
I have applied Nonclustered index over a column on a table.
Designed a SP for insertion which caters for updation incase the criteria based on the input is met.
The logic goes like this
Incase there exists a row containing the value of the column that is indexed for uniqueness, there should be updation. If not there should be a new row created.
However often there is an error message that is placed above. This happens only on some of the SPs and only on rare occasions.
Can any body tell me if there is any problem with the SQL Server 2005
Thanks in advance
R Suresh, SQLDBA
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Unique Constraint Does Not Permit Duplicate NULL Values
After adding a Unique constraint to a database I cannot add more than one record with a null value for the constrained field. I've tried both adding the constraint to an empty table as well as a table with multiple null values already in the subject field; both efforts have failed. According to BOL SQL-7 allows Unique Constraints on fields with Null values. Am I missing a step? I do need to allow nulls in the field yet ensure that when there is a non-null value it is unique. The SQL statement I've used is: ALTER TABLE tbl_MasterUIC ADD CONSTRAINT uniquesamplenbr UNIQUE NONCLUSTERED (samplenbr) Thanks for any and all suggestions
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Unique Index
Just found out that creating a unique index does not create a unique constraint, but creating a unique constraint creates unique index. But effectively they do the same thing.
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Unique Index
if this question is inappropriate here, I apologize (it's at least obliquely related). I have been using ssno as a unique key in a datawarehouse I have been working on because all of the component systems have had it. I now have a database to add where ssno is not available. I have first, last address, city, state,zip and dob. Question is, how to construct a unique identifier from those components. If not unique, then at least usable? Again, if this post is wrong here, I apologize Thanks for any input Walter
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Unique Index
How to findout whether a Index is unique or not? ------------------------ I think, therefore I am - Rene Descartes
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Can't Add Bit Column To Unique Index
This is for SQL 2000 (SP 2) using Enterprise Manager. I have a table with a unique index comprised of several int fields. The index needs to include an additional bit field that is part of the table. But when I go to modify the index, the bit field name doesn't appear in the Column Name list. Can anyone shed any light on the problem? Thanks.
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Creating A Unique Index
HiI tried the following from the help file...When you create or modify a unique index, you can set an option toignore duplicate keys. If this option is set and you attempt to createduplicate keys by adding or updating data that affects multiple rows(with the INSERT or UPDATE statement), the row that causes theduplicates is not added or, in the case of an update, discarded.For example, if you try to update "Smith" to "Jones" in a table where"Jones" already exists, you end up with one "Jones" and no "Smith" inthe resulting table. The original "Smith" row is lost because anUPDATE statement is actually a DELETE followed by an INSERT. "Smith"was deleted and the attempt to insert an additional "Jones" failed.The whole transaction cannot be rolled back because the purpose ofthis option is to allow a transaction in spite of the presence ofduplicates.But when I did it the original "Smith" row was not lost.I am doing something wrong or is the help file incorrect.Dan
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Unique Constraint Index
When I add a unique key constraint to column in SQL 6.5 why does it alsocreate an index. e.g. In the table subaccounts I added a unique keyconstraint for the column login and SQL creates an index with the nameUQ_SubAccounts_2__19 (UKC).Does this also mean that there is no need to create an index for thiscolumn?thxMansoor
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UNIQUE INDEX If Not NULL
Hello ! for MS SQL 2000 how can i set an unique index on Serial column but only if Serial IS NOT NULL CREATE UNIQUE INDEX [IX_Product] ON [Product]([Serial]) ON [PRIMARY] i can have 100 rows with a NULL Serial thank you
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Unique Constraint/index
I'm trying to weight the pros and cons of unique constraints and unique indexes. I understand that creating a unique constraint also creates an index. If that is the case, why not just use a unique index? Could someone give me an example of when you would want an unique constraint over an unique indexes Thanks in advance
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Better Performance With Unique Index?
I have read that you get better performance with unique indexes rather than non-unique indexes. I have experimented with this in SQL 2000. I have two identical tables (with about 250000 rows each) with a 12-character unique column. In one table I define it as a regular index and in the other I define it as a unique index. No matter what I try I get identical performance, and the query optimizer shows an identical plan. I even tried clauses such as WHERE 1 < (SELECT COUNT(*) FROM TheTable WHERE key_column = OtherTable.key_column) which should obviously return nothing if TheTable.key_column is unique. However the query still ran a long time no matter if the index is unique or not. I have also tried a unique constraint instead of a unique index and got the same (non)results. Can anyone come up with an example where creating a unique index actually makes a performance difference?
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